I USED A PIECE OF 1/8" MATERIAL AND BENT A 1/8" LIP IN ONE END. THEN DRILLED A 1/4" HOLE IN IT SO THE LIP LINED UP WITH THE EDGE OF THE OPENING. I USED A CENTER PUNCH TO PUT A DIMPLE IN THE PIECE TO KEEP IT FROM TURNING OR MOVING. THAT'S WHAT THE 3/16" HOLE IS FOR THAT I DRILLED IN THE TOOL.
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